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Built-in antenna for radio communication terminals

  • US 6,271,796 B1
  • Filed: 01/26/1999
  • Issued: 08/07/2001
  • Est. Priority Date: 01/30/1998
  • Status: Expired due to Fees
First Claim
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1. A built-in antenna for a radio communication terminal, comprising:

  • a terminal bottom board, comprising a grounded conductor;

    a helical di-pole antenna, connecting to said terminal bottom board and being positioned so that a plane of said helical di-pole antenna is perpendicular to a plane of said terminal bottom board, said helical dipole antenna having a diameter not exceeding 0.1 wavelength; and

    a balanced/unbalanced conversion circuit, comprising an impedance conversion system and connecting to a feeding end of said helical di-pole antenna;

    wherein said terminal bottom board reflects an electromagnetic wave from said helical di-pole antenna in a direction away from a user; and

    wherein said balanced/unbalanced conversion circuit minimizes an antenna current flowing to said terminal bottom board.

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